relational processing 中文意思是什麼
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When a query on the relational views is issued, it is repeatedly rewritten using the rules. this process generates number of navigation plans to compute the query ; the cost of these plans is then estimated based on a simple cost model that takes network accesses as the primary cost parameter. in this way, an efficient execution plan is selected for processing the query
當根據關系視圖發出一個查詢時，它被重復的使用重寫規則來重寫，這個過程產生大量的導航方案來運算查詢。這些方案的代價是根據代價模型來評估的。代價模型是用網路訪問作為原始的代價參數。 -
The principal of the digital communication theory and the relational theory of the synchronization are introduced in fourth chapter. in fifth chapter, author detailedly describes the methods of two kind digital phase - locked loop, expounds the processing of design and implementation by fpga
第四章介紹了數字通信中位同步的相關理論，並在第五章詳細敘述了兩種數字鎖相位同步的原理，並論述了使用fpga設計實現這兩種位同步方法的過程。 -
Therefore, more challenges have arisen for query optimization in database grid than traditional distributed database. following this observation, the design of a query optimizer in dartgrid ii is presented, and a heuristic, dynamic and parallel query optimization approach to processing query in database grid is proposed. a set of semantic tools supporting relational database integration and semantic - based information browsing has also been implemented to realize the above vision
克服數據庫網格特性所帶來的困難需要為數據庫網格提供全局一致的數據表達模式各結點數據模式到全局模式之間的映射方法各結點之間負載平衡和結點動態加入和退出系統的控制策略數據庫網格查詢優化器結構設計以及一整套適合數據庫網格的查詢優化演算法。 -
This radar database system fits for china ' s radar network using object - oriented programming design method, recording some important parameters of radar data : the longitude, latitude of radar station, radar type, radar wavelength, radar data format, weather kind ( kind of intensity radar echo, schema of velocity radar, echo shape ) embodying in the radar data, etc. it also records the weather course information embodying in a series of relational radar data : the beginning time of weather course, the ending time of weather course, weather type, etc and the disk information, including recording time, recording contents, recording data number and weather type, etc. above all, this system realizes some basic operational processing : adding, deletion, updating, query of records and also some assistant functions : exportation, data transformation, displaying, backing up of data
該數據庫系統採用面向對象程序設計方法，用visualc + + 6 . 0作為應用程序的前端開發工具，用microsoftaccess2000做數據庫，不僅實現了對雷達基數據信息的一些基本操作：記錄信息添加、刪除、修改、查詢，還實現了處理、分析雷達基數據所需的一些操作：數據導出，數據格式轉換、數據回顯（圖像方式和動畫方式） 、數據壓縮、備份等，另外針對日前雷達臺站存儲雷達數據的現狀，還實現了對存儲光盤的管理。 -
I study mainly the storage of record and object, and bring forward the method of storage when the instance of object is embodied inside of record. 3 ) in the aspect of indexing, i presented a method that is generalized b - tree ( gbt ) and combining technique of founction template of c + + build the universal algorithm of queries, insert and delete. 4 ) finally, i analyze deeply and improve the query processing system of ormdbms, and confirm performance algorithm of linking and queries based on relational database. management system ( rdbms )
在系統結構和特性中分析了系統所採用的兩層體系結構，並且詳細探討了在設計和實現數據庫時所涉及到的幾個主要問題：支持復雜對象、類型擴充、繼承機制和規則系統等；在存儲機制的討論中，主要研究了記錄和對象以及包含了對象實例記錄的存儲方法；在索引技術研究中，本文提出了類屬b樹的索引方法，通過c + +的函數模板技術給出了通用類屬b樹查詢、插入及其刪除的基本演算法；最後，文章以關系數據庫為基礎，深入分析並改進了在對象關系多媒體數據庫中的查詢處理系統，確定了選擇和連接操作的具體演算法。 -
This course is designed to introduce graduate students to the foundations of database systems, focusing on basics such as the relational algebra and data model, query optimization, query processing, and transactions
課程描述本課程設計的目的是給研究生介紹數據庫的基礎知識，關注于基礎，如關系代數和數據模型，查詢優化、查詢處理和事務。 -
Online transaction processing oltp relational databases are optimal for managing changing data
聯機事務處理（ oltp ）關系數據庫最適合於管理變化的數據。 -
Vision sensor system is an integration of optics, mechanics and electronics mainly based on ccd image sensor. this system is relational with mechanics, optics, electronics, computer vision, digital image processing and software engineering
視覺傳感器系統是以ccd圖像傳感器為主要敏感元件構造而成的一個集現代光、機、電技術為一體的集成系統，涉及機械、光學、電子、計算機視覺、數字圖像處理、軟體工程等方面的技術。 -
Abstract : temporal relational database model is extended from relational database by adding time processing ， and temporal object - orient database model is extended from object - orient database by adding time processing
文摘:時態關系數據庫在關系數據庫的基礎上擴充了對時間數據的處理，而時態面向對象數據庫則是在面向對象數據庫的基礎上擴充了對時間數據的處理。 -
Secondly, in consideration of better integration of heterogeneous data resources and query optimizing, i adopt the " data tree " theory to construct a mathematical model of eihdr and solve the query in data resources by relational operation in mathematics. there are some differences in different data source ' s basic processing capability and i bring forward an eihdr ' s integration strategy based upon data tree to solve them
其次，出於對數據源集成和查詢優化的考慮，本文採用「數據樹」理論對企業異構數據源集成建立數學模型，通過數學運算來處理涉及多個數據源的查詢問題，針對企業數據源存在「基本操作能力」的問題，本文提出了基於「數據樹」理論的企業異構數據源集成策略，實現了系統模型，並使查詢的效率得到提高。 -
And the normalized storage of xml in relational databases is implemented. needless redundancy is eliminated, and abnormal operations are reduced. the methods proposed have some significance for processing xml in the future
實現了xml文檔在關系數據庫中的規范化存儲，極大地減少了xml數據在關系數據庫中的冗餘存儲，大大減小了操作異常。 -
That ' s not to say that it is impossible to store complex data in a flat - file database ; just that doing so can be more costly in time and processing power compared to a relational database
這不是說用平面文件數據庫不能存儲復雜數據，而是若這樣做要比用關系型數據庫耗用更多的時間和處理能力 -
Mining structures can be based on either relational or online analytical processing olap data sources
挖掘結構可以基於關系數據源或聯機分析處理（ olap ）數據源。 -
A command - line tool used to rebuild the online analytical processing olap or relational database
，它是用於重新生成聯機分析處理（ olap ）或關系數據庫的命令行實用工具。
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